A substitute has entered the game when the ball is alive and
d. A pitcher takes his place on the pitcher's plate
So since all warm up pitches are taken during a dead ball, the player can be replaced prior to the umpire making the ball alive at the start of the inning without having to pitch to a batter. Only the starting pitcher must pitch to a minimum of one batter before being removed.
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .